[gfortran] Segfault in dependency code (PR23906)

[Paul Brook]

The attached patch fixes a segfault in the dependency code.

The code was dividing the size of the range by the wrong stride (which may be 
NULL). The point of this function is to apply the same transformation to both 
ranges, so it's definitely the division, and the the condition that's 
incorrect.

I also updated the comment to make this clearer.

Tested on i686-linux.
Applied to mainline.

Paul

2005-09-16  Paul Brook  <paul@codesourcery.com>

	PR fortran/23906
fortran/
	* dependency.c (transform_sections): Divide by correct value.
	Elaborate comment.
testsuite/
	* gfortran.dg/dependency_1.f90: New test.
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